JP2802580B2 - Bent shield excavator for sharp curves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sharp bend shield excavator for use in a shield construction method for tunnel construction.

[0002]

2. Description of the Related Art In recent years, in a shield method, the number of places where shafts are constructed has been minimized for traffic measures and economic reasons. As a result, the construction of sharp curves with a small curvature, such as a shield machine turning at an intersection at a right angle, has increased.

[0003] As for the curve construction, there is a method of excavation using a copy cutter or an over cutter, but the use of a mid-bent shield excavator is one of the methods for minimizing the voids due to the excavation.

FIG. 5 shows a conventional half-fold shield excavator. The shield excavator 1 is divided into a front trunk 2 and a rear trunk 3, and the rear end of the front trunk 2 and the rear trunk 3 are separated. The front end is loosely fitted, and the front trunk 2 and the rear trunk 3 are connected by a direction correcting jack 4 inside the shield machine 1.

A plurality of the direction correcting jacks 4 are arranged at appropriate intervals in the circumferential direction of the shield machine 1, and the direction correcting jacks 4 in the direction to be bent are in a contracted state. When the front body 4 is extended, the front body 2 is bent with respect to the rear body 3, so that the cutter head 5 of the front body 2 draws a curve.

[0006]

In such a center-bent shield excavator, it is necessary to increase the bending angle by using the front body 2.
It is necessary to provide a considerable gap for loosely fitting the rear end of the rear body 3 and the front end of the rear trunk 3, but as a result, it is impossible to cope with intrusion of earth and sand, groundwater, and the like. Further, if such a gap is reduced, there is a limit to the bending angle, and bending at a sharp curve is limited.

On the other hand, a three-fold shield excavator having two bent portions is also considered, but has disadvantages in that the structure is complicated and the manufacturing cost is high.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to maintain a watertight structure of the entire shield excavator while maintaining the watertight structure of a sharp curve with a remarkably small curvature. Is to provide.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention divides a shield machine into three parts, a front body, a middle body, and a rear body. The front end of the front trunk and the front end of the rear trunk are fitted to this, a bracket is integrally formed inside the middle trunk, and the end of the direction correcting jack provided by the telescopic jack provided on this bracket is pivotally mounted. By connecting the front body and the rear body through the direction correcting jack, the bracket and the direction correcting jack are provided in a total of four at the top, bottom, left and right, and the propulsion jack is located between them It is the gist.

[0010]

According to the present invention, the front body and the rear body are bent through the middle body having a spherical outer periphery, so that the shield machine is divided into three parts in addition to the whole. The body becomes a bending axis, and a bending angle twice that of the related art can be ensured without any gap.

In addition, the use of a telescopic type jack for the direction correcting jack makes the length of the jack that extends and the length of the jack that contracts opposite to the jack significantly different so that the jack can cope with a sharper bend. become.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional side view of a sharply curved middle bending shield machine according to the present invention at the time of straight construction, and FIG. 2 is a vertical sectional side view at the time of curved construction.

According to the present invention, the shield machine 1 is divided into three parts, a front body part 2, a middle body part 6, and a rear body part 3, and the middle body part 6 has a spherical body 7 on the outer periphery and a front body part. 2 and the front end of the rear trunk 3 were fitted. In the figure, reference numeral 5 denotes a cutter head.

The front body 2 and the rear body 3 are connected to each other by a direction correcting jack 4 for axially attaching the ends. The direction correcting jack 4 is a multi-rod telescopic jack. As shown in FIG. 3, a total of four direction correcting jacks 4 are provided at the top, bottom, left and right. In FIG. 3, reference numeral 8 denotes a bracket of the jack 4 for correcting the direction,
This is integrally formed inside the middle body 6. Reference numeral 9 denotes a propulsion jack (shield jack), and a total of 12 jacks are arranged in the illustrated example.

FIG. 4 shows another device relation of the shield excavating machine 1, wherein 10 is a cutter driving hydraulic motor, 11 is a bearing,
Reference numeral 12 denotes a segment erector including an erector turning hydraulic motor 12a, an erector turning ring 12b, and an erector head 12c. 13 is a segment.

A spherical bearing 14 is provided inside the middle body 6 and the propulsion jack 9 is held by the spherical bearing 14 in a tiltable manner. By holding the propulsion jack 9 with the spherical bearing 14 in this manner, the inclination of the propulsion jack 9 at the time of bending can be absorbed.

The segment elevator 12 is provided on the propulsion jack 9 and is slidable with respect to the rear trunk 3. When mounting the segment elevator 12, a sliding jack for sliding may be incorporated as needed.

The segment width becomes extremely small at the time of the sharp curve construction compared to the straight construction (normal state), and the center position of the segment shifts backward. By providing the segment erector 12 integrally with the propulsion jack 9 as described above, it is possible to cope with such a deviation by making it slidable.

Next, usage and operation will be described.
At the time of straight line construction, as shown in FIG. 1, all four direction correcting jacks 4 are extended to an equal length, and the same use as the ordinary shield excavator 1 is performed.

As shown in FIG. 2, during the curve construction, the jack 4 for correcting the direction of the direction in which the shield machine 1 is to be bent is in a contracted state, and the jack 4 for correcting the direction on the opposite side. Is extended. In this case, since the direction correcting jack 4 is a telescopic type jack, the jack length of the extending jack and that of the jack contracting oppositely are significantly different, and it is possible to cope with a sharper bend. FIG. 2 shows an example of the bending angle. The inclination of the axis is about 10 ° × 2.

Since the front body 2 and the rear body 3 are bent via the middle body 6 having a spherical outer periphery, the shield machine is divided into three parts in addition to the whole. Torso 6
Becomes a bending axis, and a bending angle twice as large as that of the related art can be secured without generating a gap.

Further, in the curve construction, as shown in the lower half of FIG. 4, the width of the segment 13 in the inner portion becomes extremely small, and the center position of the segment shifts backward. Therefore, the segment erector 12 is slid backward by the propulsion jack 9 so as to cope with such a shift.

[0023]

As described above, the sharp-curved shield excavator for sharp curves according to the present invention can be applied to a sharply curved curve with a curvature as small as about 1/2 of the conventional one while maintaining the watertight structure of the entire shield excavator. It is possible and can be manufactured at a low cost with a simple structure.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a sharply bent middle shield excavator according to the present invention at the time of straight construction.

FIG. 2 is a longitudinal sectional side view of a sharply curved middle-bent shield excavator according to the present invention when a curve is constructed.

FIG. 3 is a sectional view taken along line AA of FIG. 4;

FIG. 4 is a vertical sectional side view of another portion of the sharp-curved middle bend shield excavator according to the present invention at the time of straight construction.

FIG. 5 is a vertical sectional side view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shield excavator 2 ... Front torso 3 ... Rear torso 4 ... Jack for direction correction 5 ... Cutter head 6 ... Middle torso 7 ... Spherical body 8 ... Bracket 9 ... Propulsion jack 10 ... Cutter drive hydraulic motor 11 ... Bearing Reference Signs List 12 ... Sector Erector 12a ... Elector turning hydraulic motor 12b ... Elector turning ring 12c ... Electr head 13 ... Segment 14 ... Spherical bearing

Claims (1)

(57) [Claims] 1. A shield machine is divided into three parts, a front body part, a middle body part, and a rear body part. The middle body part has an outer periphery as a spherical body, and fits a front end of a front body part and a front end of a rear body part. A bracket is integrally formed on the inside of the middle torso, and the end of the jack for correcting the direction by the telescopic jack provided on this bracket is used to correct the direction of the front body and the rear torso. A sharp-curved center bending shield excavator which is connected via jacks, and a total of four brackets and direction correcting jacks are provided at the top, bottom, left and right, and a propulsion jack is arranged between them.